300-320 · Question #266
What is an advantage of using the Cisco FabricPath feature in a data center environment?
The correct answer is C. Equal-Cost Multipath can be used to choose the forwarding path. Cisco FabricPath uses IS-IS as its control plane to enable ECMP across the fabric, allowing multiple active forwarding paths simultaneously unlike STP-based designs.
Question
What is an advantage of using the Cisco FabricPath feature in a data center environment?
Options
- AVSS does not have to be configured.
- BTransparent Interconnection of Lots of Links can be configured simultaneously.
- CEqual-Cost Multipath can be used to choose the forwarding path.
- DThe control plane and management plane remain separate.
How the community answered
(28 responses)- A4% (1)
- B4% (1)
- C93% (26)
Why each option
Cisco FabricPath uses IS-IS as its control plane to enable ECMP across the fabric, allowing multiple active forwarding paths simultaneously unlike STP-based designs.
VSS is an independent Cisco technology for combining two physical switches into one logical switch and is not a requirement or benefit of FabricPath.
TRILL (Transparent Interconnection of Lots of Links) is the IETF standard that inspired FabricPath, but they are separate implementations and cannot be configured simultaneously on the same device.
FabricPath assigns unique switch IDs and uses a routed-like forwarding model so that Equal-Cost Multipath can be leveraged across multiple links simultaneously, eliminating the blocked ports that STP would otherwise create and maximizing available bandwidth.
FabricPath does not inherently separate the control plane from the management plane; that separation is an architectural design principle unrelated to FabricPath's specific capabilities.
Concept tested: Cisco FabricPath ECMP forwarding in data center fabrics
Source: https://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/white_paper_c11-687554.html
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